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1.河南中医药大学 第二临床医学院,郑州 450000
2.河南省中医药研究院,郑州 450000
苑小龙,在读硕士,从事中医药防治恶性肿瘤的临床与基础研究,E-mail: 18300698533@163.com
蔡小平,主任医师,研究生导师,从事中医药防治恶性肿瘤的临床与基础研究,E-mail:ccxpfan@126.com
收稿日期:2022-04-28,
网络出版日期:2022-09-02,
纸质出版日期:2023-03-20
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苑小龙,魏征,张俊萍等.黄芩苷通过p53介导的SLC7A11下调诱导胃癌细胞铁死亡[J].中国实验方剂学杂志,2023,29(06):71-78.
YUAN Xiaolong,WEI Zheng,ZHANG Junping,et al.Baicalin Induces Ferroptosis in Gastric Cancer Cells via p53-mediated SLC7A11 Down-regulation[J].Chinese Journal of Experimental Traditional Medical Formulae,2023,29(06):71-78.
苑小龙,魏征,张俊萍等.黄芩苷通过p53介导的SLC7A11下调诱导胃癌细胞铁死亡[J].中国实验方剂学杂志,2023,29(06):71-78. DOI: 10.13422/j.cnki.syfjx.202202122.
YUAN Xiaolong,WEI Zheng,ZHANG Junping,et al.Baicalin Induces Ferroptosis in Gastric Cancer Cells via p53-mediated SLC7A11 Down-regulation[J].Chinese Journal of Experimental Traditional Medical Formulae,2023,29(06):71-78. DOI: 10.13422/j.cnki.syfjx.202202122.
目的
2
以人胃癌SGC-7901细胞为研究对象,通过在培养液中添加不同浓度黄芩苷(0、100、200、400 μmol·L
-1
),探讨黄芩苷对胃癌细胞增殖的抑制作用及可能的作用机制。
方法
2
黄芩苷处理SGC-7901细胞后,采用噻唑蓝(MTT)比色法检测黄芩苷对胃癌细胞的抑制作用;同时通过添加3-氨基-4-环己基氨基苯甲酸乙酯(Fer-1)来观察细胞在黄芩苷处理后细胞的存活;使用实时荧光定量聚合酶链反应(Real-time PCR)和蛋白免疫印迹法(Western blot)检测铁死亡相关基因的表达;MTT比色法和酶联免疫吸附法分别检测丙二醛(MDA)含量和谷胱甘肽(GSH)水平;分别运用过表达和小干扰核糖核酸(siRNA)的方式来观察肿瘤蛋白53(p53)/溶质载体家族7成员11(SLC7A11)通路在铁死亡调控中的作用。
结果
2
与空白组比较,黄芩苷处理后SGC-7901细胞活性明显降低(
P
<
0.05,
P
<
0.01),具有浓度和时间依赖性。与黄芩苷组比较,Fer-1干预显著缓解了黄芩苷引起的SGC-7901细胞活性降低(
P
<
0.01)。与黄芩苷组比较,Fer-1+黄芩苷组细胞中MDA含量及前列腺素内过氧化物合成酶2(PTGS2)mRNA和蛋白水平显著降低(
P
<
0.01),GSH活性、谷胱甘肽过氧化酶4(GPX4)mRNA和蛋白水平均显著升高(
P
<
0.01)。与空白组比较,黄芩苷组细胞中SLC7A11蛋白表达水平明显降低(
P
<
0.05,
P
<
0.01),具有浓度依赖性。与黄芩苷组比较,SLC7A11过表达细胞在黄芩苷处理后细胞中活性氧(ROS)水平和MDA含量显著降低(
P
<
0.01),GSH活性显著升高(
P
<
0.01)。与空白组比较,黄芩苷组细胞中p53荧光强度显著升高(
P
<
0.01)。与黄芩苷组比较,转染p53 siRNA的细胞在黄芩苷处理后细胞中p53蛋白表达水平显著降低(
P
<
0.01),SLC7A11表达水平显著升高(
P
<
0.01)。
结论
2
黄芩苷能够有效抑制胃癌细胞SGC-7901的增殖,其机制可能与其调控p53/SLC7A11介导的细胞铁死亡有关。
Objective
2
To explore the inhibitory effect of different concentration of baicalin (0, 100, 200, 400 μmol·L
-1
) on the proliferation of human gastric cancer SGC-7901 cells and the underlying mechanism.
Method
2
SGC-7901 cells were treated with baicalin. Then methyl thiazolyl tetrazolium (MTT) assay was employed to examine the inhibitory effect of baicalin on the cells. At the same time, ferrostatin-1 (Fer-1) was added to observe the viability of cells after baicalin treatment. The expression of ferroptosis-related genes was detected by Real-time polymerase chain reaction (Real-time PCR) and Western blot. The content of malondialdehyde (MDA) and the level of glutathione (GSH) were detected respectively by MTT assay and enzyme-linked immunosorbent assay. The role of tumor protein 53 (p53)/solute carrier family 7 member 11 (SLC7A11) pathway in the regulation of ferroptosis was investigated respectively via overexpression and small interfering RNA (siRNA) methods.
Result
2
Compared with the blank group, baicalin decreased the viability of SGC-7901 (
P
<
0.05,
P
<
0.01) in a dose- and time-dependent manner. The intervention of Fer-1 significantly alleviated the decrease of SGC-7901 cell viability caused by baicalin (
P
<
0.01). In addition, compared with the baicalin group, Fer-1+baicalin group showed decrease in MDA content and the mRNA and protein levels of prostaglandin-endoperoxide synthase 2 (PTGS2) in the cells (
P
<
0.01), and increase in GSH activity and mRNA and protein levels of glutathione peroxidase 4 (GPX4) (
P
<
0.01). The protein level of SLC7A11 in the baicalin group was decreased compared with that in the blank group (
P
<
0.05,
P
<
0.01) in a dose-dependent manner. Compared with the baicalin group, the reactive oxygen species (ROS) level and MDA content in SLC7A11-overexpressing cells were significantly decreased after baicalin treatment (
P
<
0.01), and the GSH activity was significantly increased (
P
<
0.01). The fluorescence intensity of p53 in the cells of the baicalin group was increased compared with that of the blank group (
P
<
0.01). Compared with the baicalin group, the expression level of p53 protein in the cells transfected with p53 siRNA was significantly decreased after baicalin treatment (
P
<
0.01), and the expression level of SLC7A11 was significantly increased (
P
<
0.01).
Conclusion
2
Baicalin can effectively inhibit the proliferation of SGC-7901 cells by regulating p53/SLC7A11-mediated ferroptosis.
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